Radiant energy – Invisible radiant energy responsive electric signalling – Including ionization means
Patent
1985-04-10
1987-11-17
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Including ionization means
2503361, 250370, 250374, 250385, 378 19, G01T 1185, H01J 4700
Patent
active
047076089
ABSTRACT:
A technique for detecting the spatial distribution of propagating energy induces secondary energy produced in a detector to drift in a predetermined direction at a predetermined velocity and synchronously moves the detector in a direction opposite to the direction of drift of the secondary energy at a velocity equal in magnitude to the magnitude of the velocity of drift of the secondary energy. Although the secondary energy is drifting with respect to the detector, the synchronous detector movement causes the secondary energy to appear stationary with respect to a source of radiation, resulting in "kinestatis" of the secondary energy. The secondary energy resulting from the radiation integrates along stationary paths in the detector (operated as a "kinestatic detector") and is subsequently detected when a collection volume of the detector sweeps through the stationary secondary energy. Signal integration can occur over long periods of time while resolution in the direction of movement of the detector is determined by the detector output sampling rate. A detector having n-by-l detecting elements can simulate the operation of an n-by-m element detector for use in digital radiography and computed tomography and other imaging and non-imaging sensing techniques. The detector may take the form of a xenon gas ionization chamber. Field distortion eliminating techniques are used to eliminate variations in charge carrier drift velocity in such an ionization chamber. Charge carrier mobility and drift velocity are adjusted to synchronize charge carrier movement with detector movement.
REFERENCES:
patent: 3963924 (1976-06-01), Boag et al.
patent: 3983398 (1976-09-01), Boyd
patent: 3995159 (1976-11-01), Elliott
patent: 4031396 (1977-06-01), Whetten et al.
patent: 4047040 (1977-09-01), Houston
patent: 4057728 (1977-11-01), Peschmann et al.
patent: 4075492 (1978-02-01), Boyd et al.
patent: 4150290 (1979-04-01), Erskine et al.
patent: 4179608 (1979-12-01), Walenta
patent: 4239967 (1980-12-01), Carr et al.
patent: 4286158 (1981-08-01), Charpak et al.
patent: 4301368 (1981-11-01), Riihimaki
patent: 4311908 (1982-01-01), Goulianos et al.
patent: 4317038 (1982-02-01), Charpak
patent: 4320299 (1982-03-01), Bateman et al.
patent: 4378499 (1983-03-01), Spangler et al.
patent: 4485307 (1984-11-01), Osborne et al.
F. A. DiBianca and M. D. Barker, "Kinestatic Charge Detection", Medical Physics, vol. 12, No. 3 (May/Jun. 1985), pp. 339-343.
French Thesis by Olivier Peyret, "Study of a Multiline Digital Radiographic Imager by Synchronized Scanning on the Ion Drift of a Gas Detector"; English translation of Thesis by Joan E. Fetter.
"Computed Radiography" by Foley and DiBianca, Radiology of the Skull and Brain: Technical Aspects of Computed Tomography, chapter 28, pp. 4312-4325 (Newton & Potts, 1981).
"The Time Projection Chamber", American Institute of Physics Conference Proceedings No. 108 (Vancouver, 1983) (New York, 1984).
Rossi et al, Ionization Chambers and Counters: Experimental Techniques, Chapter 3 at 31-71 (McGraw Hill, 1948).
Zurmuhle et al, "A .DELTA.E-E Telescope with Very Large Solid Angle", 203 Nuclear Instruments and Methods, 261-67 (1982).
Berceanu et al, "Detection and Identification of Heavy Ions at 180.degree. Using a Proportional .DELTA.-E-E Chamber", 35 Stud. and Cercet. Fiz., No. 5, 503-505 (Rumania, 1983).
Fenster et al, "Characteristics of a Linear Xenon Detector Array for Scanned Projection Radiography", Proceedings of the AAPM Summer School, 214-44 (1984).
Drost et al, "A Xenon Ionization Detector for Digital Radiography", vol. 9, No. 2, Med. Phys., 224-30 (1982).
Rutt et al, "A Xenon Ionization Detector for Scanned Projection Radiography: Theoretical Considerations", vol. 10, No. 3, Med. Phys., 284-92 (1983).
Peschmann, "Xenon Gas Ionization Detectors", Radiolog of the Skull and Brain Technical Aspects of Computed Tomography, Section 3, pp. 4112-4126 (Newton & Potts, 1981).
Johns et al, "Gas Ionization Methods of Electrostatic Image Formation in Radiography", 47 British Journal of Radiology, 519-29 (1974).
Wilkinson, Ionization Chambers and Counters, .sctn.4.2, 59-62 (Cambridge Press, 1950).
Butz-Jorgensen et al, "Investigation of Fission Layers for Precise Fission Cross-Section Measurements With a Gridded Ionization Chamber", 86 Nuclear Science and Engineering, 10-21 (1984).
Asselineau et al, "Performance of a Bragg Curve Detector for Heavy Ion Identification", 204 Nuclear Instruments and Methods, 109-15 (1982).
Hotzl et al, "Experiences With Large-Area Frisch Grid Chambers in Low-Level Alpha Spectrometry", 22 Nuclear Instruments and Methods in Physics Research, 290-94 (1981).
DiBianca et al, "Digital Radiography of the Chest Using a Computed Tomography Instrument", 133 Radiology, 231 (1979).
DiBianca et al, "Intravenous Angiography Using Scanned Projection Radiography: Preliminary Investigation of a New Method", 15 Investigative Radiology, 220 (1980).
"Design of Grid Ionization Chambers" by O. Bunemann et al, Canadian Journal of Research, Section A, A27 (1949).
"The Practical Realisation and Performance of Sprite Detectors", A. Blackburn et al, Infrared Physics, vol. 22, pp. 57 to 64 (1982).
"An Integrating Detector for Serial Scan Thermal Imaging", by C. T. Elliot et al, Medical Physics, vol. 22, pp. 31-42 (1982).
"Simple Dielectric Liquids Mobility, Conduction, and Breakdown", by T. J. Gallagher, pp. 10-21, Clarendon Press, Oxford (1975).
Hannaher Constantine
Howell Janice A.
University of North Carolina at Chapel Hill
LandOfFree
Kinestatic charge detection using synchronous displacement of de does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Kinestatic charge detection using synchronous displacement of de, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinestatic charge detection using synchronous displacement of de will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1451385